Abstract
Several studies in different species have documented that tardigrades are among the most radiation-tolerant animals on Earth, surviving doses of ionizing radiation on the order of kGy. Both low-LET and high-LET radiation have been used with no apparent differences in the tolerance of the animals. Tolerance to ionizing radiation in tardigrades also seems to be independent of whether the animal has entered a dry anhydrobiotic state or is hydrated with normal activity. However, when exposed to UV radiation, desiccated tardigrades show a higher tolerance than hydrated animals. Recent studies in several species have shown that tardigrade embryos have considerably lower tolerance to ionizing radiation compared to adults, and embryos in the early stage of development are clearly more sensitive to radiation than those in the late developmental stage. The molecular mechanisms behind radiation tolerance in tardigrades are still largely unclear, but available evidence suggests that mechanisms related to both the avoidance of DNA damage and the repair of damage are involved.
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Notes
- 1.
Note that the “Hypsibius dujardini” strain used in most (possibly all) studies on development and stress tolerance referred to in this chapter has recently been redescribed by Gasiorek et al. (2018) as a new species, Hypsibius exemplaris, distinguished from the Hypsibius dujardini sensu stricto.
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The current review was financially supported by the Swedish Space Research Board (grant 87/11 to AW).
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Jönsson, K.I., Levine, E.B., Wojcik, A., Haghdoost, S., Harms-Ringdahl, M. (2018). Environmental Adaptations: Radiation Tolerance. In: Schill, R. (eds) Water Bears: The Biology of Tardigrades. Zoological Monographs, vol 2. Springer, Cham. https://doi.org/10.1007/978-3-319-95702-9_12
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